Add error handling to socket streams

runtime/bin/socket_stream_impl.dart

Index: runtime/bin/socket_stream_impl.dart
diff --git a/runtime/bin/socket_stream_impl.dart b/runtime/bin/socket_stream_impl.dart
index 678259db6f4e2d6bb6d237d1b096ac02a6a2ca7b..952b4d1585b961d22e017e5c342b9b23edfed47e 100644
--- a/runtime/bin/socket_stream_impl.dart
+++ b/runtime/bin/socket_stream_impl.dart
@@ -66,10 +66,6 @@ class _SocketInputStream implements SocketInputStream {
     _socket._onClosed = _onClosed;
   }
 
-  void set onError(void callback()) {
-    _socket.onError = callback;
-  }
-
   void _onClosed() {
     _closed = true;
     if (_clientCloseHandler !== null) {
@@ -77,9 +73,19 @@ class _SocketInputStream implements SocketInputStream {
     }
   }
 
+  void set onError(void callback(Exception e)) {
+    _errorCallback = callback;
+  }
+
+  void _onError(Exception e) {
+    close();
+    if (_errorCallback != null) _errorCallback(e);
+  }
+
   Socket _socket;
-  Function _clientCloseHandler;
   bool _closed = false;
+  Function _clientCloseHandler;
+  Function _errorCallback;
 }
 
 
@@ -123,15 +129,6 @@ class _SocketOutputStream
     }
   }
 
-  void set onError(void callback()) {
-    _streamErrorHandler = callback;
-    if (_streamErrorHandler != null) {
-      _socket.onError = _onError;
-    } else {
-      _socket.onError = null;
-    }
-  }
-
   bool _write(List<int> buffer, int offset, int len, bool copyBuffer) {
     if (_closing || _closed) throw new StreamException("Stream closed");
     int bytesWritten = 0;
@@ -180,15 +177,19 @@ class _SocketOutputStream
     if (_onNoPendingWrites == null) _socket._onWrite = null;
   }
 
-  void _onError() {
+  void set onError(void callback(Exception e)) {
+    _errorCallback = callback;
+  }
+
+  void _onError(Exception e) {
     close();
-    if (_streamErrorHandler != null) _streamErrorHandler();
+    if (_errorCallback != null) _errorCallback(e);
   }
 
   Socket _socket;
   _BufferList _pendingWrites;
   var _onNoPendingWrites;
-  var _streamErrorHandler;
+  Function _errorCallback;
   bool _closing = false;
   bool _closed = false;
 }